Charlton Heston spent up to five hours a day at rehearsals conducting Ludwig van Beethoven's Symphony No. 5 in C-, Op. 67, Allegro con brio, the music performed over the opening credits. In his diaries, Heston describes it as better than parting the Red Sea.
Charlton Heston wanted Anne Heywood or Jessica Walter for the role of Annabelle Rice, ultimately portrayed by Kathryn Hays.
Anton Diffring would be cast once again as a Nazi officer in the War classic, Where Eagles Dare (1968), the following year.
The orchestra's performances, which include works by Pyotr Ilyich Tchaikovsky, Ludwig van Beethoven, Johannes Brahms, Richard Wagner, and Franz Schubert, were performed by the Los Angeles Phillarmonic Orchestra.
Filmed at Universal Studios including a set built for the film The Hunchback of Notre Dame (1923), Counterpoint (1967) began shooting on November 21, 1966 and concluded January 24,1967. Two days were removed from the production schedule and the script was rewritten without consulting the director Ralph Nelson.